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Valve stem grinding machine,valve grinder VR90. $3,200.00. or Best Offer. 17 watching. Sioux Valve Seat High Speed Grinder Driver 1709 . $1,500.00. $85.00 shipping. or Best Offer. 11 watching. Huge Lot Of Mixed Automotive Valve Grinding Tools 7 Grinders. $99.95. $21.90 shipping.